2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/23/2019 | 11:30 AM - 11:45 AM | TEMPERATURE EFFECTS ON SHREDDER AND MICROBIAL PROCESSING OF LEAF LITTER IN STREAMS DEPEND ON SEASON AND LITTER TYPE | 254 B
TEMPERATURE EFFECTS ON SHREDDER AND MICROBIAL PROCESSING OF LEAF LITTER IN STREAMS DEPEND ON SEASON AND LITTER TYPE
Microorganisms and shredding invertebrates are key drivers of allochthonous carbon processing in streams but contribute to different fates of carbon (CO2 vs. storage/transport of fine particles). These groups may respond differently to temperature: while microbial processing is predicted to increase with temperature following the Metabolic Theory of Ecology (MTE), shredder contributions to litter breakdown may be lower than predicted by MTE as temperatures rise due to physiological constraints. To investigate the effects of temperature on shredder and microbial carbon processing, we conducted twelve 2-month incubations of Rhododendron maximum and Acer rubrum leaves across a stream temperature gradient at the Coweeta Hydrologic Laboratory. Microbial breakdown rates were positively related to temperature in both warmer and cooler months, roughly following MTE. Shredder processing increased with temperature in warmer months but decreased with temperature in cooler months, illustrating the importance of seasonal phenology in dictating shredder carbon processing. Consistently higher activation energy of Rhododendron vs. Acer breakdown indicates higher temperature sensitivity of recalcitrant vs. labile carbon. Future work will focus on quantifying the effects of organismal life history and litter quality on carbon allocation to CO2, storage, and transport as temperatures rise.
- ClimateChange
- Invertebrate
- Microbial
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Presenters/Authors
Carolyn Cummins
(), The University of Georgia, carolynsc1225@gmail.com;
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Amy Rosemond
(), University of Georgia, rosemond@uga.edu;
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Phillip Bumpers
(), Odum School of Ecology, University of Georgia, bumpersp@gmail.com;
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Nathan Tomczyk
(), University of Georgia, nathan.tomczyk@gmail.com;
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Jonathan P. Benstead
(), The University of Alabama, jbenstead@ua.edu;
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Vlad Gulis
(), Coastal Carolina University, vgulis@coastal.edu;
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Seth Wenger
(), University of Georgia, sethwenger@fastmail.fm;
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